> right after login. v7.3-rc5 selects 4:2:0 again for those modes when the
> color format is automatic. Do the same here, including HDMI FRL.
>
> Keep automatic YCbCr 4:4:4 for the other HDMI modes, as 7.1 did. The TMDS
> depth fallback also runs for HDMI FRL, so a mode that does not fit at
> 4:4:4 can still drop to 4:2:0.
The first hunk, which drops the force_yuv_pixel_format check for 4:2:0-only
modes, is the right fix for the black screen. The other two are not.
Automatic YCbCr 4:4:4 is not what mainline does. 106b4a2a78b2
("drm/amd/display: Try RGB before YCbCr 4:4:4 in stream validation"), in
v7.3-rc6, deliberately went back to RGB first. Running the TMDS 4:2:0 fallback
on HDMI FRL links changes behaviour on links that are untested.
Could you send a v3 with only the 4:2:0-only change, keeping the FRL clause?
Please also get an Acked-by or Reviewed-by from an AMD display maintainer
(Harry, Leo, Alex or Jerry) on the list.
--
Thanks,
Sasha
